Perhaps you should try some spelling variations:
nam buoc » nam duoc, nam quoc, nam thuoc
buoc ban » quoc ban, buon ban, duoc ban
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
qua nam » quan nam, cua nam, quang nam
ban anh » ban hanh, ban banh, ban danh
cua tre » cua te, cuu tre, cua triet
anh de » hanh de, anh d, anh ve
de cua » le cua, te cua, dieu cua
x hoi » xa hoi, 5 hoi
o hoi » co hoi, o hoc, o hai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty nang ((((x hoi) or (x ho))) or (o hoi)). hieu qua nam buoc ban anh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((((x hoi) OR (x ho))) OR (o hoi)). hieu qua nam buoc ban anh de cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((((x hoi) or (x ho))) or (o hoi)). hieu qua nam buoc ban anh de cua tre*.